Re: function as a pointer.

steelman22 <steelman22@[EMAIL PROTECTED]
> wrote:
> I have a function
> 
> function myfun(....) : pnode {pnode is pointer}
> ..
> is it ok to do this thing:
> 
> function myfun(....) : pnode
>  begin
> ...
> new(myfun);
      ^^^^^
According to ANSI/ISO this is a recursive call.  

> myfun:=nil;

Legal, but since the assignment destroys previous value it is probably
not what you want.

> ...
> end;
> 
> and so on...
> I understand that name of the function is seen as variable inside this
> function...
>

No, name of the function works as variable if it is the only thing
on the left hand side of the assignment statement.  Otherwise 
name of the function means (possibly malformed) recursive call.

So, to allocate memory inside myfun you need an extra variable.
 
> so if i modify it inside the function... the function will return it
> (there is no such a thing as 'return')... and it won't be distroyed
> after execution of my function.
> 
> so that i could write:
> var
> ohyeah:pnode;
> begin
> ohyeah:=myfun();
> 

either:

ohyeah:=myfun;

or

ohyeah:=myfun(...);

(if a function has no parameters ANSI/ISO does not allow empty
parentheses).

-- 
                              Waldek Hebisch
hebisch@[EMAIL PROTECTED]